Sorry for the late respond, but I didn't have internet yesterday.
Scott, I tried that, but there is no change. The version which is already installed is 5.3.8, and with php53-xml command, installs the version 5.3.3 :S
php-common is updated,
but even if I enter the command 'yum -y install php-xml', and then 'yum -y update php-xml', it says that the package php-xml is available, but not installed. Something weird happens here.
I have a server running CentOS 5.6, with virtualmin 3.
Before I buy the XF script, I want to be sure that it will run on my server, so I checked with xenforo_requirements.php script, and there was a problem:
Then, I followed this thread...